Remove copyright and comments from empty files

According to policy change in HACKING:
http://docs.openstack.org/developer/hacking/#openstack-licensing
empty files should no longer contain any comments and copyright notices.

Change-Id: I78b399db314518be917e1c1931f2ee5c3a2ee95a
Closes-Bug: #1262424
Merge "Remove copyright and comments from empty files"